Radio Digest (Oct 1923-July 1924)

wtr October 20, 1923 RADIO D I G E S T — Illustrated Further Details of the Famous Miloplex Hook-Up Part IV— Introducing King Miloplex III, the Real One LISTEN — Miloplex fans from six to sixty. Remember, the Biblical saying, "The J truth shall be revealed even unto babes"; not that I didn't intend to Rive you the true story, the real King Miloplex, but making good on a promise, so here it is, just as my good friend Brownie (the artist) pictures it, all dolled up and "roarin' " to go. Yet retaining the simplicity of a girl from Main street. In it you will find something new in circuit compilation, also a something that should interest you as a foundation for further experimental woi-k, a circuit generally known as a single circuit, yet in reality a three circuit scheme of which the rotor of the variometer in parallel with the variable condenser compose the third or oscillating control circuit, though in no wise mechanically connected to the circuit. Many will call this circuit a wave trap — maybe it is — yet several engineers give us as many separate opinions as a cur dog has ONE OF MANY TESTIMONIALS Gentlemen: Your new "Wizard Miloplex" is the very best circuit that you have ever published. It has the Flewelling beat three times over. I was very skeptical when I first saw it but hooked it up to satisfy my curiosity and had the surprise of my life. The first station that I heard when I switched on the storage battery was the Atlanta Journal and they came in so loud that I had to take off the phones. This circuit is also very selective. I can tune out WJAX and tune in WGY, which is a difficult proposition here in Akron (Ohio) just thirty miles from WJAX. The circuit seems to be really super-regenerative. I am using it with honeycombs and find that it works equally well for the two-hundred-meter waves and those above the broadcast lengths. You certainly made a scoop in publishing that circuit. I thank you. A. E. McCuIlough. pedigrees as to just what it is and the theory of its action. So call it what you will as I am primarily only interested in knowing that it is the final one real trick that makes the King step out and do the unusual. The idea of retarding or controlling oscillations in a major circuit through maintaining a separate oscillator is not new. Our good friend Marconi used some such scheme in his old number 103 tuner, while later experimenters have used it in various circuit combinations, though I am believing Reinartz Coil $1.85 The Improved Basket Weave, Covering AH Broadcasting Wave Lengths With each coil we send FREE two large blueprints, picture hookup and panel layout, list of materials, and fully illustrated instructions for construcUon and operation. Buy before the fall rush sets in We sell all parts required for this wonderfully efficient receiver — panel, coil, condensers, socket, vernier rheostat, variable grldlealt, dials, switches, posts, contact points, wire, spaghetti, etc. (no tubes or phones) for only $9.85. Postage additional on all shipments. Send no money PAY THE POSTMAN. All Goods Shipped Parcel Post C. O. D. RADIO SURPLUS STORES, Helena, Montana Improved Ground Clamp ffRESSv Hue \, Equipped with Fahnestock Patent Wire Connectors Easily Attached No Soldering. For Radio Use Only At Your Dealers Fahnestock Electric Co. Long Island City, N. Y. By the Mystery Man .OOZ. # TfflP 00O25 * T w .OOOZ5 .0005 * .OOE L-^AAAAA/ ■ I I +* 4-Hi 1 1— 1 ./VNA^A that each experimenter has always placed the inductance in a fixed position relative to the energizing circuit which is to be controlled. My use of it is within, or at center of, the magnetic field, it being quite generally admitted that the greatest inductance or transformer value (if one so desires to term it) is thus obtained — while in addition, through being able to rotate this inductance through the magnetic field, it is variable as to coupling, affording a flexibility that is wholly desirable. In total then, we maintain a separate oscillator which is variable both as to capacity and to inductive coupling. Many are going to ask just what the action of this circuit is. And my answer is — "Lordy, if I knew I'd be as happy as a deaf and dumb man in a boiler factory." Fools enter, you know, where angels dare not tread. Several times I have had the theory right on the tip of my tongue, when, bang! the Plexy would go prancing into either a "super" or "heterodyne" effect and I'd have to swallow my tongue. However, several are now fussing or playing with it (yes, engineers), and I'm going to have some fun reading their verdict. The technical editor of Radio Digest will shortly give you his theory; following it, Engineer Forbes is going to tell me his story. Forbes, you know, is a crack on transmitting, hence I anticipate his view point will give the Miloplex another pedigree. Anyway the fun is on and you are welcome — yes, requested — to tell me through Radio Digest what you think the theory is. The next step in my series will be to amplify the Miloplex and I'm going to try and get this to you for next week's story, although a gentleman in Dallas tells me he amplified circuit one, so methinks he will beat me to it on circuit three. Go to it, Doc, but first get in touch with an ear specialist and have him send me the bill — I'd rather owe it to him than beat him out of it. Don't believe all you see in the papers. Snakes, didn't I just mail the typesetter three dozen pencils with erasers on for causing me to say mutual inductance in place of mutual conductance. I phoned him, but he swore he followed copy; yes, indeed, even if it went out the window, say I. Don't forget, friend fan, that your Plexy will be no better than the parts you use in building it. I have five good reasons for not 2650 MILES with ONE TUBE. Broadcasting from Atlantic Coast and Cuba heard in California by users of the CKOSS COUNTRY CIRCUIT. Tills range Is due to simplicity of set and operation as only one control is used for tuning. Easily and cheaply built. Dry cell tubes may be used. Complete instructions, with panel layout, assembly views, etc., postpaid for 25o. Or further information for red stamp. VESCO RADIO SHOP, Bx. 117, Oakland, Cal. f 1000 In Prizes MJMr ^Qgr ^kW Offered by Fountain Pencil Co. 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